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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7317) server-side request problems are hard to debug
Date Wed, 12 Dec 2012 22:09:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530410#comment-13530410
] 

Andrew Purtell commented on HBASE-7317:
---------------------------------------

{quote}
Todd: I wouldn't want to put it in Hadoop common – then we'd have to do elaborate stubbing
in our compat code in order to use it while still supporting older versions. It is also useful
for non-Hadoop projects (eg something like Cassandra)
{quote}

That's disappointing. Then my concern about depending on a project in this state stands.

{quote}
Stack: Hope was that we'd add tracing to hbase w/ this as a start (and that hadoop itself
would be adding trace I suppose so we could go down into datanodes). If no progress on tracing
before, say 0.96, yeah, lets remove it. But maybe there will be progress made in this issue.
{quote}

Perhaps, otherwise +1 for removing it for 0.96.
                
> server-side request problems are hard to debug
> ----------------------------------------------
>
>                 Key: HBASE-7317
>                 URL: https://issues.apache.org/jira/browse/HBASE-7317
>             Project: HBase
>          Issue Type: Brainstorming
>          Components: IPC/RPC, regionserver
>            Reporter: Sergey Shelukhin
>            Priority: Minor
>
> I've seen cases during integration tests where the write or read request took an unexpectedly
large amount of time (that, after the client went to the region server that is reported alive
and well, which I know from temporary debug logging :)), and it's impossible to understand
what is going on on the server side, short of catching the moment with jstack.
> Some solutions (off by default) could be 
> - a facility for tests (especially integration tests) that would trace Server/Master
calls into some log or file (won't help with internals but at least one could see what was
actually received);
> - logging the progress of requests between components inside master/server (e.g. "request
id=N received", "request id=N is being processed in MyClass", N being drawn on client from
local sequence - no guarantees of uniqueness are necessary).

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